#include <47func.h>
int main(int argc, char *argv[])
{
    // ./chatroom 192.168.118.128 1234
    ARGS_CHECK(argc,3);
    int sockfd = socket(AF_INET,SOCK_STREAM,0);
    // AF_INET ipv4 SOCK_STREAM TCP
    struct sockaddr_in serverAddr;//带in 是ipv4地址 带in6是ipv6地址 不带是通用地址
    serverAddr.sin_family = AF_INET;//ipv4
    serverAddr.sin_addr.s_addr = inet_addr(argv[1]);//把点分十进制的ip地址转换成32位大端存储的地址
    serverAddr.sin_port = htons(atoi(argv[2]));//把端口用大端存储
    int reuse = 1;// setsockopt函数中SO_REUSEADDR的选项
    int ret = setsockopt(sockfd,SOL_SOCKET,SO_REUSEADDR,&reuse,sizeof(reuse));
    ERROR_CHECK(ret,-1,"setsockopt");
    ret = bind(sockfd,(struct sockaddr *)&serverAddr,sizeof(serverAddr));
    ERROR_CHECK(ret,-1,"bind");
    ret = listen(sockfd,10);
    ERROR_CHECK(ret,-1,"listen");
    struct sockaddr_in clientAddr;
    socklen_t clientAddrSize = sizeof(clientAddr);//一定要赋予初值
    fd_set monitorset;//监听集合
    FD_ZERO(&monitorset);
    FD_SET(sockfd,&monitorset);//监听集合里面只有sockfd
    fd_set readyset;//就绪集合
    int netfds[4] = {-1,-1,-1,-1};
    int curidx = 0;
    char buf[4096] = {0};
    while(1){
        memcpy(&readyset,&monitorset,sizeof(fd_set));
        select(10,&readyset,NULL,NULL,NULL);
        if(FD_ISSET(sockfd,&readyset)){
            // 有客户端 connect
            netfds[curidx] = accept(sockfd,(struct sockaddr *)&clientAddr,&clientAddrSize);
            ++curidx;
            // sockfd专门用来建立连接 netfd负责和客户端的数据通信
            printf("addrlen = %d\n",clientAddrSize);
            printf("client sin_family = %d\n",clientAddr.sin_family);
            printf("client ip = %s\n", inet_ntoa(clientAddr.sin_addr));
            printf("client port =%d\n", ntohs(clientAddr.sin_port));
            // 修改监听的文件描述符
            FD_SET(netfds[curidx-1],&monitorset);
            if(curidx >= 4){
                FD_CLR(sockfd,&monitorset);
            }
        }
        for(int i = 0; i < curidx; ++i){
            if(FD_ISSET(netfds[i],&readyset)){
                bzero(buf,sizeof(buf));
                recv(netfds[i],buf,sizeof(buf),0); //收发送的消息
                for(int j = 0; j < curidx; ++j){
                    if(i == j){
                        continue;
                    }
                    send(netfds[j],buf,strlen(buf),0);
                }
            } 
        }
    }
    return 0;
}

